Mentioned in SAL (#wikimedia-operations) [2018-10-27T00:00:06Z] <mutante> icinga1001 - using wmf-auto-reimage to reinstall gets stuck at initial puppet run after reboot - Still waiting for Puppet after 105.0 minutes - aborting on cumin, loggin in directly and manually running puppet (T202782T208100)

What got stuck?
The first puppet run can easily take up to 2h of time based on the host role and server capabilities. You can check its progress tailing the cumin log whose path is listed at the start of the reimage process to stdout (the 2nd of the two logs listed).
To check further what's going on directly in the host you could also login either with the install_console script or your personal key (based where the host is in the puppetization process) or, worse case scenario you can't with both, via the mgmt console as root.